{"id":"CVE-2026-99214","title":"drm/vc4: hdmi: Move packet RAM enable to PM runtime","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: hdmi: Move packet RAM enable to PM runtime\n\nAudio can be triggered by the HPD handler and start up before video has\nbeen restored, calling vc4_hdmi_write_infof…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= b47a72f30768ffe76e105b3e91ad7022003e8504 < 6b03e354526f6bad60ed3a7f08fec8b7d29d2f27","Linux >= b47a72f30768ffe76e105b3e91ad7022003e8504 < 6a987992c78e2e04f71e685d1c589f8ea2151fa2","Linux >= b47a72f30768ffe76e105b3e91ad7022003e8504 < 3f57b34485dc01e5a2db60a89a6ae5439a897e53","Linux 6.11"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T10:36:07.867Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99214","references":[{"url":"https://git.kernel.org/stable/c/6b03e354526f6bad60ed3a7f08fec8b7d29d2f27"},{"url":"https://git.kernel.org/stable/c/6a987992c78e2e04f71e685d1c589f8ea2151fa2"},{"url":"https://git.kernel.org/stable/c/3f57b34485dc01e5a2db60a89a6ae5439a897e53"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T11:09:40.356Z","slug":"CVE-2026-99214","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: hdmi: Move packet RAM enable to PM runtime\n\nAudio can be triggered by the HPD handler and start up before video has\nbeen restored, calling vc4_hdmi_write_infoframe() for the audio infoframe.\nvc4_hdmi_write_infoframe() needs Packet RAM to be on to store the\ninfoframe, however, if the video hasn't been enabled,\nvc4_hdmi_encoder_post_crtc_enable() hasn't been called and therefore, the\nPacket RAM can be disabled by the time vc4_hdmi_write_infoframe() executes,\ncausing the following splat:\n\n[  201.570266] ------------[ cut here ]------------\n[  201.570293] Packet RAM has to be on to store the packet.\n[  201.570367] WARNING: drivers/gpu/drm/vc4/vc4_hdmi.c:683 at vc4_hdmi_write_infoframe+0x404/0x494 [vc4], CPU#0: wireplumber/1606\n[...]\n[  201.658650] Hardware name: Raspberry Pi 4 Model B Rev 1.5 (DT)\n[...]\n[  201.758499] Call trace:\n[  201.760967]  vc4_hdmi_write_infoframe+0x404/0x494 [vc4] (P)\n[  201.766607]  vc4_hdmi_write_audio_infoframe+0x1c/0x28 [vc4]\n[  201.772247]  write_infoframe+0xbc/0x140 [drm_display_helper]\n[  201.777975]  drm_atomic_helper_connector_hdmi_update_audio_infoframe+0x80/0xdc [drm_display_helper]\n[  201.787140]  vc4_hdmi_audio_prepare+0x4ac/0x570 [vc4]\n[  201.792252]  drm_connector_hdmi_audio_prepare+0x24/0x30 [drm_display_helper]\n[  201.799390]  hdmi_codec_prepare+0x100/0x160 [snd_soc_hdmi_codec]\n[  201.805471]  snd_soc_pcm_dai_prepare+0xd4/0x100 [snd_soc_core]\n[  201.811375]  __soc_pcm_prepare+0x60/0x12c [snd_soc_core]\n[  201.816752]  soc_pcm_prepare+0x34/0x58 [snd_soc_core]\n[  201.821863]  snd_pcm_do_prepare+0x70/0x8c [snd_pcm]\n[  201.826798]  snd_pcm_action_nonatomic+0xe4/0x174 [snd_pcm]\n[  201.832350]  snd_pcm_prepare+0xc8/0xd8 [snd_pcm]\n[  201.837021]  snd_pcm_common_ioctl+0x458/0x614 [snd_pcm]\n[  201.842308]  snd_pcm_ioctl+0x30/0x48 [snd_pcm]\n[  201.846802]  __arm64_sys_ioctl+0x88/0xd8\n[  201.850769]  invoke_syscall+0x48/0xf4\n[  201.854470]  el0_svc_common+0x80/0xd8\n[  201.858171]  do_el0_svc+0x1c/0x28\n[  201.861520]  el0_svc+0x3c/0xb0\n[  201.864605]  el0t_64_sync_handler+0x68/0xdc\n[  201.868834]  el0t_64_sync+0x198/0x19c\n[  201.872536] ---[ end trace 0000000000000000 ]---\n\nConsidering that Packet RAM enable is essentially a power management\nconfiguration, move its enabling/disabling to the Runtime PM hooks.\n\nNote that post_crtc_disable() still stops all infoframes, but keeps Packet\nRAM enabled, leaving it to be disabled by runtime suspend.\n\n## Affected\n\n- `Linux >= b47a72f30768ffe76e105b3e91ad7022003e8504 < 6b03e354526f6bad60ed3a7f08fec8b7d29d2f27`\n- `Linux >= b47a72f30768ffe76e105b3e91ad7022003e8504 < 6a987992c78e2e04f71e685d1c589f8ea2151fa2`\n- `Linux >= b47a72f30768ffe76e105b3e91ad7022003e8504 < 3f57b34485dc01e5a2db60a89a6ae5439a897e53`\n- `Linux 6.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}